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To reproduce: 1. create a project, for example "temp". The project type does not seem to matter, it was witnessed with the creation of a regular java project and a web project. 2. close the project and delete it from disk manually 3. create a new project with the same name "temp" in the same location. the result will be an IllegalArgumentException being thrown inside the IDE. To work arround this the IDE needs to be closed and restarted after deleting the project directory manually, then the project can be recreated. Exception stacktrace: java.lang.IllegalArgumentException: Already a project in MasterFileObject@8fac46[C:/source/temp] at org.netbeans.spi.project.support.ant.ProjectGenerator$1.run(ProjectGenerator.java:101) at org.netbeans.spi.project.support.ant.ProjectGenerator$1.run(ProjectGenerator.java:99) at org.openide.util.Mutex.writeAccess(Mutex.java:379) at org.netbeans.spi.project.support.ant.ProjectGenerator.createProject0(ProjectGenerator.java:98) at org.netbeans.spi.project.support.ant.ProjectGenerator.createProject(ProjectGenerator.java:93) at org.netbeans.modules.web.project.api.WebProjectUtilities.setupProject(WebProjectUtilities.java:603) at org.netbeans.modules.web.project.api.WebProjectUtilities.createProjectImpl(WebProjectUtilities.java:195) at org.netbeans.modules.web.project.api.WebProjectUtilities.access$000(WebProjectUtilities.java:104) at org.netbeans.modules.web.project.api.WebProjectUtilities$1.run(WebProjectUtilities.java:171) at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:120) at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:499) at org.netbeans.modules.web.project.api.WebProjectUtilities.createProject(WebProjectUtilities.java:169) at org.netbeans.modules.web.project.ui.wizards.NewWebProjectWizardIterator.instantiate(NewWebProjectWizardIterator.java:147) at org.openide.loaders.TemplateWizard$InstantiatingIteratorBridge.instantiate(TemplateWizard.java:1023) at org.openide.loaders.TemplateWizard.handleInstantiate(TemplateWizard.java:595) at org.openide.loaders.TemplateWizard.instantiateNewObjects(TemplateWizard.java:416) at org.openide.loaders.TemplateWizardIterImpl.instantiate(TemplateWizardIterImpl.java:253) at org.openide.loaders.TemplateWizardIteratorWrapper.instantiate(TemplateWizardIteratorWrapper.java:165) at org.openide.WizardDescriptor.callInstantiateOpen(WizardDescriptor.java:1384) at org.openide.WizardDescriptor.callInstantiate(WizardDescriptor.java:1341) at org.openide.WizardDescriptor.access$1600(WizardDescriptor.java:119) at org.openide.WizardDescriptor$Listener$2$1.run(WizardDescriptor.java:1908) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561) [catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)
well, possibly a duplicate of existing issue ( I can't find it right now). Please delete thhe project using the IDE's own UI ("Delete project" action) rather than manual delete on command line. The manual delete should also work after some time spent in the IDE and a few GC cycles. unlikely to be fixed, as there are more important cases to optimize for.
unlikely to be fixed in 7.0 or next version. the create/delete/create project cycle in one location is both hard to fix and unlikely scenario in day-to-day use.
NetBeans.org Migration: changing resolution from LATER to WONTFIX